Not the current shenanigans, the first Brexit, actually the first two Brexits.

Note: this is not an actual photograph on the first Brexit because they didn’t have color film yet, this is a recreation. One bank
holiday weekend they built a dam from Scotland to Norway, and filled in the English Channel. Then they flushed all the toilets
repeatedly until the water got high enough to top the dam and took this color picture.

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England is separated from the rest of Europe by a body of water called the English Channel; the bit of water where England is closest to France is called the Dover Strait. But the strait wasn’t always there — it was likely created by two major erosion events, according to a study published today in Nature Communications. The first one likely happened around 450,000 years ago, around the same time Neanderthals first appeared in Europe. That’s when huge amounts of water spilled over from a large lake sitting at the edge of a massive ice sheet that stretched from Britain to Scandinavia.

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The second one may have occurred 160,000 years ago, when catastrophic flooding opened the Dover Strait. When the ice age ended and sea levels rose, water flowed into that gap. Just like that, Britain became an island.

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To get more definitive answers, scientists would need to drill through the sediments filling those huge plunge holes at the bottom of the sea.

I wouldn’t touch that line with a ten foot pole… never know if EX-2 is stalking.

Now both the links contain many charts and illustrations showing the geology, hydrology, chemistry, and meteorology of the area, and how they interact, so I won’t insult your intelligence by explaining further.